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WASHINGTON - JANUARY 20: U.S. Vice President Joe Biden (L) takes the oath of office as his wife Dr. Jill Biden (R) looks on during the official swearing-in ceremony at the Naval Observatory on January 20, 2013 in Washington, DC. Biden and U.S. President Barack Obama will be officially sworn in a day before the ceremonial inaugural swearing-in. (Photo by Kevin Lamarque-Pool/Getty Images)